Consider a compensated n-type silicon at T = 300 K, with a conductivity of ̃σ = 16 Ω⁻¹.cm⁻¹ and an acceptor doping concentration of 1×10¹⁷ atoms/cm⁻³. Determine the donor concentration. A compensated semiconductor is one that contains both donor and acceptor impurity atoms in the same region. The intrinsic carrier concentration of Si is nᵢ = 1.5 × 10¹⁰ cm⁻³, electron mobility is 400 cm²/V.sec.